Worlds companions
Worlds companions
First evidences of the existence of exolunas.
It is one of those ideas that, like the existence of life in the Universe outside the land, it is usually taken for more than likely although we did not have direct evidence of it. It is simply that our common sense tells us that we can not be special in this, that it is not possible that of all the seemingly infinite immensity only around a yellow star of average size we can find them. And even more so when we are discovering thousands and thousands of new planets at an increasing rate. And if there are planets, there must be moons. One idea leads to the other, but science requires evidence, something that was lacking until now.
And it's in the hands of space telescopes Hubble Y Kepler from which comes the first sign of what we might call exolunas. This seems to reside in the star system Kepler-1625, about 8,000 light-years from the land, and accompany a giant planet, possibly gaseous. Obviously nothing is simple when it comes to detect tiny variations of brightness of an exoplanet, and even more complicated of a possible moon, which may be hidden by the greater presence of the former, but in this case the evidence, although not definitive, seems solid.
In summary, the astronomers followed the transit of Kepler-1625b ahead of his Sun, which lasted about 19 hours. And 3.5 hours later there was a second decrease in brightness, much smaller than the planet, and that indicated that "something" had also crossed the stellar disc. Unfortunately, the observations of Hubble, completed in 2017, ended before the end of this second transit, so it can not be taken for granted, although it offered an interesting clue: The planetary transit occurred one hour earlier than planned, which fits with a planet and a moon orbiting around a common center of gravity, such as occurs as land Y Moon.
"A companion moon is the simplest and most natural explanation for the second descent in the light curve and the deviation of the orbit"Explained David Kipping, an astronomer at Columbia University and one of the discoverers."It was definitely shocking to see the Hubble's light curve, my heart started beating a little faster as I kept looking at that signature. But we knew that our job was to remain calm and, in essence, to assume that it was false, to try all possible ways in which the data could deceive us. ". And although there could be alternative explanations, this seems the most coherent. Perhaps even more surprising is that the candidate could be unusually large, comparable to Neptune, revolving around a world greater than Jupiter. Big words.
This finding marks the way for future observatories, more powerful, that are able to extract from the darkness smaller moons, some of them perhaps even real Earth in the broad sense of the word. And who knows, maybe there is a Endor waiting to be discovered.
The slump foreseen in the light of Kepler-1625 by the transit of the exoplanet Kepler-1625b, which was followed by an unexpected and smaller fluctuation that astronomers associate with a possible moon. The deviation in the anticipated schedule of the first transit, which fits with the scenario that the planet was revolving around a common center of gravity with a huge companion, reinforces that idea.
The original trilogy of Star Wars proposed the idea of moons of enormous size accompanying gaseous planets. When these ideas were captured on the screen, there was not even proof that there were worlds in other stars besides the Sun, so it was all a prediction that was fulfilled, as well as that of worlds in multiple star systems. Certainly that Lucas Gorge was more than inspired.
[youtube https://www.youtube.com/watch?v=Q8QFyOaTdZk]
A possible moon?
Astronomers Find First Evidence of Possible Moon Outside Our Solar System
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